Ants wander aimlessly to find food leaving behind a pheromone scent to guide them back to the nest - the scent eventually fades. Upon discovery the ant will head back to the nest bringing food and alerting the colony. The ant continues to leave a scent signifying that this route has been traveled multiple times so success must be on the other end. Other worker ants pick up on the scent and abandon their search to join the trunk route.
Marching ants do not march in a straight line - instead they travel in the shape of a frequency wave. By doing this, it helps to orient them on the trail they are to follow.
Ants use structural guidelines to navigate to their destinations. Edges, grooves, right-angles, lines are all guidelines they follow. In this illustration, we highlight a probable route an ant would make from it's entry inside a home all the way to the food source.